8. Water shall be free from—
(a)Parasites and pathogenic micro-organisms;
(b)Escherichia coli and other coliforms and faecal streptococci in any 250 ml sample examined;
(c)Sporulated sulphite-reducing anaerobes in any 50 ml sample examined; and
(d)Pseudomonas aeruginosa in any 250 ml sample examined.